Description
Ready for taking great photos of deep-sky objects!
Le kit HD de l'aplatisseur SD est conçu pour un plan focal plat afin de produire une image nette des étoiles avec la série SD des réfracteurs APO. Il se compose d'une lentille d'aplatissement haute performance et d'un anneau de tube de connexion.
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The SD flattener HD lens improves off-axis image quality greatly with a minimum charge of the focal length. It covers a 44mm photographic field in diameter that is sufficient for the full-frame DSLR cameras.
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Ultimate light transmission AS coatings for extremely high contrast images.
The same anti-reflection AS coatings that are used for our high-end VSD100F3.8 renowned for extremely high light transmission (99.9% per surface) are provided on each of the lens surfaces of the SD flattener HD. Also, matte-finish is elaborate to eliminate internal reflections and loss of light completely.
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Optional HD focal reducer.
If combined with a Reducer HD sold optionally, the focal length will be reduced by 0.79 times (F.7.7 to F6.1) without diminishing the image circle of 44mm. A result is a sharp image throughout the photographic field of view.
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An example is taken with an SD103S using the SD Flattener HD: M3 Globular Cluster.
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Setup diagram.
Specifications
SD Flattener HD Kit
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ConstructionSD Flattener HD: 2 elements in 1 group
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CoatingsAS coatings (Over 99.9% light transmission every single surface)
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Size/WeightSD Flattener HD: 58mm x 34mm long /111g
Spacer ring SD81: 57.5mm x 22.5mm long /18g
EX Tube 66: 68mm x 76mm long /89g -
Others52mm filters are usable with the SD Flattener HD.
Use with SD81S
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SD Flattener HDFocal length: 644mm (F7.9)
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Image circle *144mm
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Illuminated field of view0.89
Use with SD103S
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SD Flattener HDFocal length: 811mm (F7.9)
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Image circle *144mm
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Illuminated field of view0.83
Use with SD115S
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SD Flattener HDFocal length: 908mm (F7.9)
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Image circle *144mm
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Illuminated field of view0.8
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*1:Imaging range of good-shaped stars and more than 60% of illuminated field of view. A 44mm in diameter covers an image sensor of full-frame DSLR cameras and a 28.8mm in diameter covers an image sensor of APS-C digital cameras.
Configuration
- SD Flattener HD
- Spacer Ring for SD81
- EX Tube 66
